groundmass
noun
ground·mass
ˈgrau̇n(d)-ˌmas 
: the fine-grained or glassy base of a porphyry in which the larger distinct crystals are embedded
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Can instances where the composition of melt in inclusions differs significantly from the composition of the groundmass surrounding the same crystal be evidence of mixing?
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Erik Klemetti, Discover Magazine, 22 Dec. 2010
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Erik Klemetti, Discover Magazine, 22 Dec. 2010
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“Groundmass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/groundmass. Accessed 1 Dec. 2024.
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